The drama students were signed up by Clic Agency, based in North Wales.

Ysgol Friars head of drama Anna Varty said: “They filmed near Capel Curig last Tuesday and Wednesday and had a ball.

“They played either noble people or resistance fighters.

“Clic Agency asked me to send over some headshots and then they found themselves on set.

“They worked long days from 8.30am to 7.30pm, but they were fed well and paid quite a lot.

“I just think it’s a fantastic experience for them, which I doubt they’ll ever forget.”

Daniel Kerry of Rhosneigr, who has appeared as an extra in the King Arthur film

Daniel Kerry, 18, who lives in Rhosneigr said: “One of the funniest things I heard was some quite passionate grunting in an area of the recreational tent, it was a curtained off but my friend and I managed to peep through to find out what was going on.

Alice Mayer, 17, from Anglesey said: “I played a noble girl, it took them an hour and half just to do my hair.

“They put hair extensions in it, and I wore a little make-up like foundation, blush and lip tint.

“I stood only feet away from Katherine Elizabeth McGrath who played Morgana in the BBC One television series Merlin, and Jude Law who was chatting away with the cast and taking selfies, we weren’t allowed to take cameras on set.

“During the funeral scene one actor had to do the same line about 20 times until Guy Ritchie was happy with it.”

Casey Williams, 18, one of the extras in Knights of the Roundtable: King Arthur

Casey Williams, 18, who is a massive Game of Thrones fan said she was playing a resistance fighter, on King Arthur’s side.

“I had to wear a Game of Thrones type costume, it was quiet a thick, heavy woollen dress, a cloak and a shawl.

“My hair was braided and curled at the bottom.

“Charlie Hunnam who plays King Arthur was just a few feet away from us.

“I had to look mournful at the funeral pyre.”

“I had such an amazing time and now I’d really like to work behind the camera, it was an amazing thing to be part of.”